4 Murni is investigating the annual salary of people from a particular town. She takes a random sample of 200 people from the town and records their annual salary. The mean annual salary is \(\pounds 28500\) and the standard deviation is \(\pounds 5100\)
Calculate a \(97 \%\) confidence interval for the population mean of annual salaries for the people who live in the town, giving your values to the nearest pound.
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